Re: Long distance links
Please allow me add to your comments.
Rich Taborek wrote:
> However, there is no need for
> any 802.3 activity to define such coexistence at 10 GbE Ethernet rates. Once the 10
> GbE standard is set, many efficient implementations which route 10 GbE to SONET will
> spring up.
This is quite an interesting and appealing argument.
> Paul's proposal specifically excludes most 10 GbE PHY proposals by requiring
> specific encoding and delimiter usage to the point of requiring that the Ethernet
> PHY = SONET OC-192 PHY. I don't believe that this is in the best interest of 802.3.
I do also have some concern about the line of logics Paul has suggested.
As far as I know MII data rate with concern to SONET is one thing and the Ethernet line
coding is another.
According to my understanding of Paul' picture:
MAC --(MII)-- 9.58Gbps --(backpressure)-- SONET Payload
-- Add SONET overhead -- SONET Line Coding(NRZ)
-- SONET line rate of 9.95Gbps
MAC --(MII)-- 10.0Gbps -- 10GbE PHY w/ line coding
-- 10GbE line rate(;depends on the line code chosen)
As I understand, we're arguing on the MII rate which sits above the PHY layer. In that
far, the decision on the line rate should not affect the choice of the 10Gbe PHY line